Title: Evaluation of qualitative, quantitative traits and yield stability analysis of rice promising lines in regional yield trials
Author: Hossein Rahimsouroush
Abstract: This experiment was carried out to determine the quantitative and qualitative traits of 9 promising rice genotypes and two check varieties, Gilaneh and Hashemi in two locations of Rasht and Tonekabon during 2017-2018. The experimental design was a randomized complete block with 4 replications and 25 cm× 25 cm hill spacing. Simple ANOVA of yield trails showed significant differences among genotypes. Combined ANOVA was calculated after the uniformity (Bartlet) test. Since the factors of year and location were random, the F test was calculated based on expected mean squares. There were significant differences among genotypes and years. The interactions of genotype × location and genotype × year were no significant. It means that the reaction of genotypes in different locations and years was the same. The effect of location was not significant. The interactions of year×location and year×location× genotype were significant. The yield stability was evaluated through within location variance and coefficient of variability (C.V.) of Lin and Binns. The results showed that genotype 19603 as known as the most stable promising line, which together with 19607 were as high yielding lines with the most total mean yield. The average yield of these genotypes was 5-5.5 tha-1. Their grain cooking quality characteristics were good with intermediate amylose content and gelatinization temperature. Consequently, these two genotypes were selected as the high-yielding promising lines with desirable morphological and grain cooking quality traits.
Keywords: Rice, Stability, Yield, Grain quality